For a while now, I've been making many little knick-knacks in my studio. All made out of wood and plaster, and now comes the time where I need to make them in a larger quantities.
This of course is not just a financial reason, though if I can made the same design many different times consistently it would be beneficial. It is also a personal growth and skills issue, I think understanding how to make casts of my work would be great for my practice!
I had a week off of work, so here's my reflections of what worked well, and what didn't.
Silcone rubber.

For this part of the process, I encased the object in clay and poured silicone rubber into the space, creating the mold. The like circles on the sides are keys to connect the two sides together.
So what did I learn from this? My workspace in more big enough. It's a table for yard work rather than casting or full own woodworking projects, so I will be buying a lovely new table that I can make equally messy!
Also that silicone is great, it allows for all details to be picked up whilst being flexible. The problem arises when wood fibres arllow the silicone in. The mould became hairy as the object was removed. I did manage to get rid of them, but would be nice not to have them in the first place.
The other thing is air. When I mixed the rubber, air got caught in the mix. There's no real evidence that this has effected my cast, but it could in the future.

Wood
As said earlier, wood is a great material I've fallen in love with. A versatile ingredient in all folk and cultural art that is available to all who wish to explore it.
However.
Wood is porous and fibrous. The clay can make it absorb its water causing it to expand. The silicone can also go into the fibres and cause problems I saw. The answer is clearly seal the object.
I have some button polish for this reason. Well, it's more for gilding on porous materials, but I will also use it for this reason.
I will stilll use wood, but I'm up for using more materials in the future. Plaster or metals for example. Talking about plaster.......
Plaster
I used plaster of paris to make the casts. This was where most of the problems came from.

You see, I don't have a vacuum chamber. I can't get the air out of the materials. So the amount of air bubbles in the casts were horrendous. I'm proud of what I did, but it showed I still have a lot to learn.
Sticking with the plaster, I tried out several consistencies. Some had more plaster, others more water. The ones that worked were the ones were I added the recommended amount of plaster to water on the box. But I know now, that's character growth.
The other problem highlighted the imperfections in the silicone mould. I hadn't created places for the air to escape once the pouring had begun. To rectify this, all i need to do is create little clay canals so air can get out and the plaster (or whatever) can fill that space.
Conclusions.
To finish, though disappointed that I wasn't somehow brilliant at the casting process straight away I still feeel they were good progressions. So here's where to go....
First, I need a better workstation. This is on order now, and I'll be able to do bigger work afterwards so it pays for itself.
Second, Be more prepared. Seal your wood. create more canals for air. Get a vacuum chamber. Be patient. I'm not the most patient person, in fact I'm starting to think something else is at play here. But that's different.
Lastly, practice. Especially with clay. I've been better with subtrative methods of making, but clay could really open up possibilities. Not just casting, but finished works or maquettes.
I'm confident with all this, and if it comes to, maybe accepting I need to get others to cast for me is not a failure, but a positive admission that sometimes you just need help. Art is a collaborative action after all.
So I leave you with a failed cast that had four casts in it that I poured plaster in just for fun!
